jennifer, i know you have been working your sources on this at the pentagon and if he cia. what do we know now and when was this issue of the affair first exposed? how did it come about? >> well, the first that it was exposed in terms of the conversation with the president occurred yesterday. general petraeus went over to the white house and he told the president that he thought he should resign. but what we're now learning from sources close to the fbi is that the fbi had been investigating general petraeus and as part of a larger investigation, the name of paula broadwell, who is general petraeus' biographer. she wrote a book that came out in january called-"all in, the education of general david h. petraeus." she had spent about a year in afghanistan with him, documenting his life, and it seems that the fbi was investigating something broader. her name came up. they started investigating concern that general petraeus now head of the cia was possibly some sort of victim in it or could be -- could be blackmailed in some sort of way. they never found that. but in the proces